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Can not get the input noise plotted, IC6.14, MMSIM 10

Kabal

Hello, Im running analysis of some circuit, i do AC, and a noise analysis, in the noise analysis. Im using ADE XL.

 In noise analysis options i specified input, output, and then plotted the VN(), now i can see the noise spectral density.

 But what i can not get is to have the input noise plotted. For example, circuit consists of one MOSFET and few resistors, all resistors are selected to generate noise. And i can go to ADE XL->Results Browser, and then go to noise-noise, and then click on any individual resistor, and see its bandwidth and noise.

 But that is just for specific resistor, now how can i get same thing done but for the input part only?

 

 

  • Kabal

     Well im looking through the docs and different sources, still cant figure out if there is any way to plot the input noise!

    Again, when i go to ADE XL results browser, i can click on any resistor, and see the noise magnitude and bandwidth. 

    Now, all i want is to have same type of graph for the INPUT part of the circuit, in other words for the node at which the noisy voltage source is connected.

     

    I tried to do some trick, like setting that input node as an output, but that did not work either. Any ideas?

     

    or lets put it this way: I want to plot the noise which i choose to generate for specific voltage source, is there any to do that?

  • Andrew Beckett

    Provided that you set up the "input source" in the noise analysis (on the choose analysis form), you can then either use the VNIN() function to plot the input-referred noise, or go to the results browser and plot "in" from the noise results.

    BTW, you don't have to do an AC and a noise analysis - noise alone is sufficient (that's not true in all simulators). Of course, you may wish to be running ac analysis for other reasons...

    Kind Regards,

    Andrew

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